The notebooks are a great feature and simple way to add basic notes and documentation. However color coding text can add a lot of value in creating clean documentation where you can find stuff at a glance.
if the notebooks would fully support textile we could create custom spans with css like in the textile documentation: http://txstyle.org/ and more specifically: http://txstyle.org/doc/33/span
This would keep things simple and add a lot more flexibility and use to the notebooks.
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